The airline stocks.
A tour operator – Thomas Cook.
An animal breeding company – Genus.
A sausage maker – Cranswick.
But there are some winners, such as Roche and GlaxosmithKline. They make flu drugs Tamiflu and Relenza, respectively.
GSK
And last but not least – hogs – as in the animals themselves.
Update:
By popular demand, cruise operator Carnival.
Related links:
Swine flu — more than you ever wanted to know – FT Alphaville
Swine flu triggers alerts worldwide – FT.com
Swine flu outbreak hits Asian stocks – FT.com